Trades Math Calculator Free Online Drill Charts

These charts are provided free for your convenience. Dynamic charts are provided in the Trades Math Calculator for PCs, Laptops and Netbooks.
Unified Tap Drill Chart
Metric Tap Drill Chart
Tapered Pipe Tap Drill Chart
Please go to www.tradesmathcalculator.com for more information.
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DECIMAL EQUIVALENTS
Drill Size Decimal MM
#80 0.0135 0.343
#79 0.0145 0.368
1/64 0.0156 0.396
#78 0.016 0.406
#77 0.018 0.457
#76 0.02 0.508
#75 0.021 0.533
#74 0.0225 0.572
#73 0.024 0.610
#72 0.025 0.635
#71 0.026 0.660
#70 0.028 0.711
#69 0.0292 0.742
#68 0.031 0.787
1/32 0.0313 0.795
#67 0.032 0.813
#66 0.033 0.838
#65 0.035 0.889
#64 0.036 0.914
#63 0.037 0.940
#62 0.038 0.965
#61 0.039 0.991
#60 0.04 1.016
#59 0.041 1.041
#58 0.042 1.067
#57 0.043 1.092
#56 0.0465 1.181
3/64 0.0469 1.191
#55 0.052 1.321
#54 0.055 1.397
#53 0.0595 1.511
1/16 0.0625 1.588
#52 0.0635 1.613
#51 0.067 1.702
#50 0.07 1.778
#49 0.073 1.854
#48 0.076 1.930
5/64 0.0781 1.984
#47 0.0785 1.994
#46 0.081 2.057
#45 0.082 2.083
#44 0.086 2.184
#43 0.089 2.261
#42 0.0935 2.375
3/32 0.0937 2.380
#41 0.096 2.438
#40 0.098 2.489
#39 0.0995 2.527
#38 0.1015 2.578
#37 0.104 2.642
#36 0.1065 2.705
7/64 0.1093 2.776
#35 0.11 2.794
#34 0.111 2.819
#33 0.113 2.870
#32 0.116 2.946
#31 0.12 3.048
1/8 0.125 3.175
#30 0.1285 3.264
#29 0.136 3.454
#28 0.1405 3.569
9/64 0.1405 3.569
#27 0.144 3.658
#26 0.147 3.734
#25 0.1495 3.797
#24 0.152 3.861
#23 0.154 3.912
5/32 0.1562 3.967
#22 0.157 3.988
#21 0.159 4.039
#20 0.161 4.089
#19 0.166 4.216
#18 0.1695 4.305
11/64 0.1719 4.366
#17 0.173 4.394
#16 0.177 4.496
#15 0.18 4.572
#14 0.182 4.623
#13 0.185 4.699
3/16 0.1875 4.763
#12 0.189 4.801
#11 0.191 4.851
#10 0.1935 4.915
#9 0.196 4.978
DECIMAL EQUIVALENTS
Drill Size Decimal MM
#8 0.199 5.055
#7 0.201 5.105
13/64 0.2031 5.159
#6 0.204 5.182
#5 0.2055 5.220
#4 0.209 5.309
#3 0.213 5.410
7/32 0.2187 5.555
#2 0.221 5.613
#1 0.228 5.791
A 0.234 5.944
15/64 0.2344 5.954
B 0.238 6.045
D 0.246 6.248
E 0.25 6.350
1/4 0.25 6.350
F 0.257 6.528
G 0.261 6.629
17/64 0.2656 6.746
H 0.266 6.756
I 0.272 6.909
J 0.277 7.036
K 0.2811 7.140
9/32 0.2811 7.140
L 0.29 7.366
M 0.295 7.493
19/64 0.2968 7.539
N 0.302 7.671
5/16 0.3125 7.938
O 0.316 8.026
P 0.323 8.204
21/64 0.3281 8.334
Q 0.332 8.433
R 0.339 8.611
11/32 0.3437 8.730
S 0.348 8.839
T 0.358 9.093
23/64 0.3594 9.129
U 0.368 9.347
3/8 0.375 9.525
V 0.377 9.576
W 0.386 9.804
25/64 0.3906 9.921
X 0.397 10.084
Y 0.404 10.262
13/32 0.4062 10.317
Z 0.413 10.490
27/64 0.4219 10.716
7/16 0.4375 11.113
29/64 0.4531 11.509
15/32 0.4687 11.905
31/64 0.4643 11.793
1/2 0.5 12.700
33/64 0.5156 13.096
17/32 0.5313 13.495
35/64 0.5469 13.891
9/16 0.5625 14.288
37/64 0.5781 14.684
19/32 0.5937 15.080
39/64 0.6094 15.479
5/8 0.625 15.875
41/64 0.6406 16.271
21/32 0.6562 16.667
43/64 0.6719 17.066
11/16 0.6875 17.463
45/64 0.7031 17.859
23/32 0.7187 18.255
47/64 0.7344 18.654
3/4 0.75 19.050
49/64 0.7656 19.446
25/32 0.7812 19.842
51/64 0.7969 20.241
13/16 0.8125 20.638
53/64 0.8281 21.034
27/32 0.8437 21.430
55/64 0.8594 21.829
7/8 0.875 22.225
57/64 0.8906 22.621
29/32 0.9062 23.017
59/64 0.9219 23.416
15/16 0.9375 23.813
61/64 0.9531 24.209
31/32 0.9688 24.608
63/64 0.9844 25.004
Back to decimal equivalents
UNIFIED TAPPING DRILLS
Tap Size (Screw O.D.) Tapping Drill Tapping Drill Size Tapping Drill: MM Clearance Drill Clearance Drill Size
#0-80UNF Tap (0.060) 3/64 0.0469 1.191 #51 0.0670
#0-80UNF RollTap (0.060) #50 0.0550 1.397 #51 0.0670
#1-64UNC Tap (0.073) #53 0.0595 1.511 #46 0.0810
#1-64UNC RollTap (0.073) #51 0.0670 1.702 #46 0.0810
#1-72UNF Tap (0.073) #53 0.0595 1.511 #46 0.0810
#1-72UNF RollTap (0.073) #51 0.0670 1.702 #46 0.0810
#2-56UNC Tap (0.086) #50 0.0700 1.778 3/32 0.0938
#2-56UNC RollTap (0.086) 5/64 0.0781 1.984 3/32 0.0938
#2-64UNF Tap (0.086) #50 0.0700 1.778 3/32 0.0938
#2-64UNF RollTap (0.086) #47 0.0785 1.994 3/32 0.0938
#3-48UNC Tap (0.099) #47 0.0785 1.994 #36 0.1065
#3-48UNC RollTap (0.099) #43 0.0890 2.261 #36 0.1065
#3-56UNF Tap (0.099) #45 0.0820 2.083 #36 0.1065
#3-56UNF RollTap (0.099) #43 0.0890 2.261 #36 0.1065
#4-40UNC Tap (0.112) #43 0.0890 2.261 #31 0.1200
#4-40UNC RollTap (0.112) #39 0.0995 2.527 #31 0.1200
#4-48UNF Tap (0.112) #42 0.0935 2.375 #31 0.1200
#4-48UNF RollTap (0.112) #38 0.1015 2.578 #31 0.1200
#5-40UNC Tap (0.125) #38 0.1015 2.578 #29 0.1360
#5-40UNC RollTap (0.125) #33 0.1130 2.870 #29 0.1360
#5-44UNF Tap (0.125) #37 0.1040 2.642 #29 0.1360
#5-44UNF RollTap (0.125) #33 0.1130 2.870 #29 0.1360
#6-32UNC Tap (0.138) 7/64 0.1094 2.779 #26 0.1470
#6-32UNC RollTap (0.138) 1/8 0.1250 3.175 #26 0.1470
#6-40UNF Tap (0.138) #33 0.1130 2.870 #26 0.1470
#6-40UNF RollTap (0.138) 1/8 0.1250 3.175 #26 0.1470
#8-32UNC Tap (0.164) #29 0.1360 3.454 #17 0.1730
#8-32UNC RollTap (0.164) #25 0.1495 3.797 #17 0.1730
#8-36UNF Tap (0.164) #28 0.1405 3.569 #17 0.1730
#8-36UNF RollTap (0.164) #24 0.1520 3.861 #17 0.1730
#10-24UNC Tap (0.190) #24 0.1520 3.861 #8 0.1990
#10-24UNC RollTap (0.190) 11/64 0.1719 4.366 #8 0.1990
#10-32UNF Tap (0.190) #20 0.1610 4.089 #8 0.1990
#10-32UNF RollTap (0.190) #16 0.1770 4.496 #8 0.1990
#12-24UNC Tap (0.216) #16 0.1770 4.496 #2 0.2210
#12-24UNC RollTap (0.216) #9 0.1960 4.978 #2 0.2210
#12-28UNF Tap (0.216) #14 0.1820 4.623 #2 0.2210
#12-28UNF RollTap (0.216) #8 0.1990 5.055 #2 0.2210
1/4-20UNC Tap 13/64 0.2031 5.159 F 0.2570
1/4-20UNC RollTap #1 0.2280 5.791 F 0.2570
1/4-28UNF Tap #3 0.2130 5.410 F 0.2570
1/4-28UNF RollTap A 0.2340 5.944 F 0.2570
5/16-18UNC Tap G 0.2610 6.629 P 0.3230
5/16-18UNC RollTap L 0.2900 7.366 P 0.3230
5/16-24UNF Tap I 0.2720 6.909 P 0.3230
5/16-24UNF RollTap M 0.2950 7.493 P 0.3230
3/8-16UNC Tap 5/16 0.3125 7.938 W 0.3860
3/8-16UNC RollTap S 0.3480 8.839 W 0.3860
3/8-24UNF Tap Q 0.3320 8.433 W 0.3860
3/8-24UNF RollTap T 0.3580 9.093 W 0.3860
7/16-14UNC Tap U 0.3680 9.347 29/64 0.4531
7/16-14UNC RollTap 13/32 0.4062 10.317 29/64 0.4531
7/16-20UNF Tap 13/32 0.4062 10.317 29/64 0.4531
7/16-20UNF RollTap Z 0.4130 10.490 29/64 0.4531
1/2-13UNC Tap 27/64 0.4219 10.716 33/64 0.5156
1/2-13UNC RollTap 15/32 0.4687 11.905 33/64 0.5156
1/2-20UNF Tap 29/64 0.4531 11.509 33/64 0.5156
1/2-20UNF RollTap 12.1mm 0.4764 12.101 33/64 0.5156
9/16-12UNC Tap 31/64 0.4844 12.304 37/64 0.5781
9/16-12UNC RollTap 17/32 0.5312 13.492 37/64 0.5781
9/16-18UNF Tap 33/64 0.5156 13.096 37/64 0.5781
9/16-18UNF RollTap 17/32 0.5312 13.492 37/64 0.5781
5/8-11UNC Tap 17/32 0.5312 13.492 41/64 0.6406
5/8-11UNC RollTap 37/64 0.5781 14.684 41/64 0.6406
5/8-18UNF Tap 37/64 0.5781 14.684 41/64 0.6406
5/8-18UNF RollTap 19/32 0.5937 15.080 41/64 0.6406
3/4-10UNC Tap 21/32 0.6562 16.667 49/64 0.7656
3/4-10UNC RollTap 45/64 0.7031 17.859 49/64 0.7656
3/4-16UNF Tap 11/16 0.6875 17.463 49/64 0.7656
3/4-16UNF RollTap 23/32 0.7187 18.255 49/64 0.7656
7/8-9UNC Tap 49/64 0.7656 19.446 57/64 0.8906
7/8-14UNF Tap 13/16 0.8125 20.638 57/64 0.8906
1- 8UNC Tap 7/8 0.8750 22.225 1-1/64 1.0156
1-12UNF Tap 59/64 0.9219 23.416 1-1/64 1.0156
1-14UNS Tap 15/16 0.9375 23.813 1-1/64 1.0156
1-1/8-7UNC Tap 63/64 0.9844 25.004 1-9/64 1.1405
1-1/8-12UNF Tap 1-3/64 1.0469 26.591 1-9/64 1.1405
1-1/4-7UNC Tap 1-7/64 1.1094 28.179 1-17/64 1.2656
1-1/4-12UNF Tap 1-11/64 1.1719 29.766 1-17/64 1.2656
1-3/8-6UNC Tap 1/7/32 1.2188 30.958 1-25/64 1.3906
1-3/8-12UNF Tap 1-19/64 1.2969 32.941 1-25/64 1.3906
1-1/2-6UNC Tap 1-11/32 1.3438 34.133 1-33/64 1.5156
1-1/2-12UNF Tap 1-27/64 1.4219 36.116 1-33/64 1.5156
1-3/4-5UNC Tap 1-9/16 1.5625 39.688 1/49-64 1.7656
1-3/4-16UNC Tap 1-11/16 1.6875 42.863 1/49-64 1.7656
2-4.5UNC Tap 1-25/32 1.7812 45.242 2-1/64 2.0156
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ISO METRIC TAPPING DRILLS
Tap Size Tapping Drill Inch
M1.6 X 0.35 Tap 1.25 0.0493
M1.6 X 0.35 RollTap 1.45 0.0571
M1.7 X 0.35 Tap 1.35 0.0532
M1.8 X 0.35 Tap 1.45 0.0571
M1.8 X 0.35 RollTap 1.65 0.0650
M2 X 0.40 Tap 1.60 0.0630
M2 X 0.40 RollTap 1.80 0.0709
M2.2 X 0.45 Tap 1.75 0.0690
M2.2 X 0.45 RollTap 2.00 0.0788
M2.3 X 0.40 Tap 1.90 0.0749
M2.5 X 0.45 Tap 2.05 0.0808
M2.5 X 0.45 RollTap 2.30 0.0906
M2.6 X 0.45 Tap 2.15 0.0847
M3 X 0.50 Tap 2.50 0.0985
M3 X 0.50 RollTap 2.80 0.1103
M3 X 0.35 Tap 2.65 0.1044
M3.5 X 0.60 Tap 2.90 0.1143
M3.5 X 0.60 RollTap 3.20 0.1261
M4 X 0.70 Tap 3.30 0.1300
M4 X 0.70 RollTap 3.70 0.1458
M4 X 0.35 Tap 3.65 0.1438
M4 X 0.50 Tap 3.50 0.1379
M4.5 X 0.75 Tap 3.70 0.1458
M4.5 X 0.75 RollTap 4.20 0.1655
M4.5 X 0.45 Tap 4.05 0.1596
M5 X 0.80 Tap 4.20 0.1655
M5 X 0.80 RollTap 4.60 0.1812
M5 X 0.50 Tap 4.50 0.1773
M5 X 0.70 Tap 4.30 0.1694
M5 X 0.75 Tap 4.25 0.1675
M5.5 X 0.90 Tap 4.60 0.1812
M5.5 X 0.50 Tap 5.00 0.1970
M6 X 1.00 Tap 5.00 0.1970
M6 X 1.00 RollTap 5.60 0.2206
M6 X 0.50 Tap 5.50 0.2167
M6 X 0.75 Tap 5.25 0.2069
M7 X 1.00 Tap 6.00 0.2364
M7 X 1.00 RollTap 6.50 0.2561
M7 X 0.75 Tap 6.25 0.2463
M8 X 1.25 Tap 6.80 0.2679
M8 X 1.25 RollTap 7.40 0.2916
M8 X 0.50 Tap 7.50 0.2955
M8 X 1.00 Tap 7.00 0.2758
M9 X 1.25 Tap 7.80 0.3073
M9 X 0.50 Tap 8.50 0.3349
M9 X 1.00 Tap 8.00 0.3152
M10 X 1.50 Tap 8.50 0.3349
M10 X 1.50 RollTap 9.30 0.3664
M10 X 0.50 Tap 9.50 0.3743
M10 X 0.75 Tap 9.25 0.3645
M10 X 1.00 Tap 9.00 0.3546
M10 X 1.25 Tap 8.75 0.3448
M11 X 1.50 Tap 9.50 0.3743
M11 X 1.00 Tap 10.00 0.3940
M12 X 1.75 Tap 10.20 0.4019
M12 X 1.00 Tap 11.00 0.4334
M12 X 1.25 Tap 10.75 0.4236
M12 X 1.50 Tap 10.50 0.4137
M13 X 1.50 Tap 11.50 0.4531
M13 X 1.75 Tap 11.25 0.4433
M14 X 2.00 Tap 12.00 0.4728
M14 X 1.25 Tap 12.75 0.5024
M14 X 1.25 Tap 12.50 0.4925
M15 X 1.50 Tap 13.50 0.5319
M16 X 2.00 Tap 14.00 0.5516
M16 X 1.00 Tap 15.00 0.5910
M16 X 1.25 Tap 14.75 0.5812
M16 X 1.50 Tap 14.50 0.5713
M18 X 2.50 Tap 15.50 0.6107
M18 X 1.00 Tap 17.00 0.6698
M18 X 1.25 Tap 16.75 0.6600
M18 X 1.50 Tap 16.50 0.6501
M18 X 2.00 Tap 16.00 0.6304
M20 X 2.50 Tap 17.50 0.6895
M20 X 1.00 Tap 19.00 0.7486
M20 X 1.50 Tap 18.50 0.7289
M20 X 2.00 Tap 18.00 0.7092
M22 X 2.50 Tap 19.50 0.7683
M22 X 1.00 Tap 21.00 0.8274
M22 X 1.50 Tap 20.50 0.8077
M22 X 2.00 Tap 20.00 0.7880
M24 X 3.00 Tap 21.00 0.8274
M24 X 1.00 Tap 23.00 0.9062
M24 X 1.50 Tap 22.50 0.8865
M24 X 2.00 Tap 22.00 0.8668
M24 X 2.50 Tap 21.50 0.8471
M27 X 3.00 Tap 24.00 0.9456
M30 X 3.50 Tap 26.50 1.0441
M33 X 3.50 Tap 29.50 1.1623
M36 X 4.00 Tap 32.00 1.2608
M39 X 4.00 Tap 35.00 1.3790
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TAPER PIPE TAPPING DRILLS
Pipe Size Drill Drill Size MM
1/16-27NPT Tap D 0.2460 6.248
1/8-27NPT Tap R 0.3390 8.611
1/4-18NPT Tap 7/16 0.4375 11.113
3/8-18NPT Tap 37/64 0.5781 14.684
1/2-14NPT Tap 23/32 0.7188 18.258
3/4-14NPT Tap 59/64 0.9219 23.416
1-11.5NPT Tap 1-5/32 1.1562 29.367
1-1/4-11.5NPT Tap 1-1/2 1.5000 38.100
1-1/2-11.5NPT Tap 1-47/64 1.7344 44.054
2-11.5NPT Tap 2-7/32 2.2188 56.358
2-1/2-8NPT Tap 2-5/8 2.6250 66.675
3-8NPT Tap 3-1/4 3.2500 82.550
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